In the 1960s when air pollution was becoming an issue, solutions were focused locally where, for example, fossil fuel smoke stacks were built taller to move pollutants away. Over time, however, it was learned that this local pollution had effects far from the source, such as the decline of deciduous forests in southern Quebec shown in this excerpt.

All across eastern North America, trees are dying and soils are being poisoned by acid rain. This compelling film, hosted by prominent scientist and broadcaster David Suzuki, investigates the frightening phenomenon of forest dieback, and proposes some solutions.